Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!RUTVM1.BITNET!A024012 From: A024012@RUTVM1.BITNET (Ross Patterson) Newsgroups: comp.protocols.tcp-ip Subject: Re: Another problem with usage charges Message-ID: <8805030046.AA28508@ucbvax.Berkeley.EDU> Date: 2 May 88 14:57:16 GMT References: Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 18 >Well -- if you read the spec, FTP itself implements checkpoint/restart. >Better protocols may be desirable, but for now we should make the most >of the ones we already have. > >Has anyone implemented checkpoint/restart in FTP? Yup. The UCLA TCP/IP for IBM's MVS system, known as the "ARPANET Control Program", or ACP, supports FTP checkpoint/restart. The Unixes we've got around here dont, since they won't accept a "MODE B" command (Sun's responds "Sorry, only stream mode supported" (or something close to that)). ACP is the basis for most, if not all, IBM MVS implementations. It supports restarting of both transmission and reception, as well as allowing the user control over the interval between checkpoints (defaulting to 100K bytes). Are there any other checkpointers out there? Ross Patterson Rutgers University